Two months in the OP has destroyed whatever goodwill there was and lost the backing of management…I mean management talked to the “problematic” people and sided

Two months in the OP has destroyed whatever goodwill there was and lost the backing of management…I mean management talked to the “problematic” people and sided with them. Maybe simply because firing people is expensive. But probably not solely for that. I mean they hired the OP to fix the team not destroy it. They could have fired them all instead of bringing the OP in. The OP is showing a naïveté regarding ordinary organizational reality and managing up as poorly as they are managing down. Fire the developers who aren’t using tests? Now you have two problems.